Update kafka-client 2.1.0 -> 2.1.1

This brings in a bug fix so that the client can re-resolve the broker
address when having connectivity issues.

See https://issues.apache.org/jira/browse/KAFKA-7755

Bug: Issue 15345
Change-Id: Ic9c53d2857848d99a178435399e63f0e16d23ce1
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index e444876..88a49ab 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -3,8 +3,8 @@
 def external_plugin_deps():
     maven_jar(
         name = "kafka-client",
-        artifact = "org.apache.kafka:kafka-clients:2.1.0",
-        sha1 = "34d9983705c953b97abb01e1cd04647f47272fe5",
+        artifact = "org.apache.kafka:kafka-clients:2.1.1",
+        sha1 = "a7b72831768ccfd69128385130409ae1a0e52f5f",
     )
 
     maven_jar(